Die for the manufacture of pen cases



May 29, 1945. o. MAYER 2,377,166

DIE FOR THE MANFACTURE OF PEN CASES Filed Feb. 9, 1943 LMM I r Il r- 1 ll III l I 1.5/i 131 (l Il I TQ. Il '51NVENTOR- Ilill HEATER Il BY Caro Mayer 6 Patented May 29, 194s UNITED STATES PATENT OFFICE DIE FOR THE MANUFACTURE F PEN CASES Otto Mayer, New York, N. Y. Application February 9, 1943, Serial No. 475,317

' 3 Claims.

This invention relates to new and useful irnprovements in molded pen cases and dies for the manufacture thereof.

More specifically, the invention proposes the construction of a molded pen case characterized by a nat back handle having a molded front panel attached thereon with the mold front panel characterized by a closed end embossed container section in a manner to permit a -pen or pencil to be inserted therein through the open end.

Still further it is proposed to provide 'a novel die for forming the front panel of the molded case which is characterized by 'a female die section and a cooperative male die section with a heater provided on one of the die sections for pressing and shaping a piece of leather to the desired shape when the die sections are brought together with a piece of leather disposed therebetween. 'f

A further object of the invention proposes to provide the sharp edges of the female die section with soft metallic strips arranged in a man` ner to have the leather material bent around when the die sections are brought togetherto prevent these corners from cutting or cracking the leather.

Another object of the invention proposes to construct the dies in such a manner that they Will be capable of forming a piece of leather with one or more adjacent closed end embossed container sections to form a/molded case capable of carrying one or more pencils or pens or any desired combination of pencils or pens.

' Still another object of the invention proposes a means for resiliently mounting certain of the male die sections when used in a die for forming three closed end embossed container sections permitting the center container section to be formed before the outer container sections in a manner to lprevent the outer die sections from gripping the leather before the center die section has had an opportunity to properly form the 4center portion of the leather from which the` case is being formed. y

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in Whichthe various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig. l is a perspective view of a molded pen case constructed in accordance with this invention.

Fig. 2 is a vertical sectional view taken substantially on the line 2-2 of Fig. 1.

Fig. 3 is a front elevational View of the die sections used for molding the front panel of the pen case shown in Fig. 1.

Fig. 4 is a plan view of the female die sections looking in the direction of the line 4--4 of Fig. 3.

Fig. 5 is a front elevational view of a molded pen case constructed in accordance with a modication of this invention.

Fig. 6 is a front elevational view of the die l a front panel II of molded leather attached to the back panel IU. The top end of the back Ipanel I0 is doubled upon itself and has its free edge inserted between the top edge of the front lpanel I I and the adjacent face of the back panel I0. This construction forms a loop I2 at the top of the 30 pen case through which a persons belt or other similar article may be inserted for mounting the case in position upon ones person. The front panel II is molded with a closed end embossed container section I3 with its top end open permitting a pen or pencil to be inserted into this container section to be conveniently carried about. The free edges of the panel sections I0 and II are securely attached together by a line E of stitches I3a. 40

In Figs. 3 and 4 the die I4 is illustrated for molding the front panel I I of the pen case shown in Fig. 1. This die is characterized by a female die section I5 and a male die section I6. The

male die section I6 is formed with a rounded pro.-

die section to cause a piece of leather which Yclamped between the die sections to be suitably embossed to conform with the shape of the `projection I'I by Vthe application of pressure and.

heat. The die sections I5 and IB are to be .mounted in a suitable press, either hand or foot "operated (not shown on the drawing), for moving the die sections relative to each other to clamp a piece of leather in position between the adjacent faces thereof.

Soft metal strips 2D are mounted upon the sharp edges of the female die section I for preventing the leather from being cut or cracked by these edges as the die sections I5 and I6 are brought together with a piece of leather superimposed therebetween. The metal strips are provided with dovetailed projections which engage complementary dovetailed recesses 2| formed on the cutaway corners of the female die sections for maintaining the strips 2D in position. When continued use of the die sections I5 and I6 causes the metal strips 20 to be deformed it `is possible to interchange them with new strips by merely sliding the old ones out of position with relation tions 33 and 34 of the male die section 32 are adapted to enter complementary rounded grooves 35 formed in the female diesection 3|. The female die section 3| is alsoprovided with a heater 3'6 for heating this die section to permit the application of heat and pressure to mold a piece of leather disposed between the die sections 3| and 32. The sharp edges of the grooves 35 in the female die section 3| are also provided with soft .metal .strips 3l for preventing these edges from cutting or cracking the strip of leather when the die sections are brought together.

These soft metal strips 3'I are provided with doveto the female die section I5 to permit .new strips to be slid into position.

The method of forming the pen case isv as follows:

A strip of leather for forming vthe front panel of a pen case is inserted in `position between the die vsections I5 and I6. The die sections tI5 and It are then brought together causing the male die section I5 to force the frontof the `liiece of leather into the female die section I5. The application of heat and pressure to the piece of leather will cause -it to be molded to conform with the shape of the dies |5-and I6. After a suitable period of time has -elapsed to properly shape the piece of leather the die sections I5 and I6 are opened, permitting the piece of leather to be taken from the female die section I5 and superimposed upon a piece of leather for forming the back panel I0 of the pen case. A line of stitches I3a is then Iapplied to the free edges of the panels I0 and II, completing the formation of the pen case.

In Fig. 5 a modied form of thepen case -is illustrated in which the back panel I0 is provided withv a free flap |2 which is adapted to be engaged beneath a strap secured in position upon the face vof the front ypanel II for closing the open end of the pen case.

The front panel II' in this form of the invention is provided with a -pair of adjacent closed and embossed container sections I3( permitting a pen and pencil, ktwo pens or two pencils to be carried in this case.

In Fig. 6 the die I4' `is illustrated for forming the front panel II .of the pen caseshown in Fig. 5. In this form of the invention the male die section I6 is provided with a pair of adjacent rounded projections which are arranged to entera pair of adjacent rounded complementary grooves I8' formed in the female die section I5. In other respects this form of the invention is identical to the previous form and like parts are indicated by like reference numerals.

In Fig. '7 a pen case is illustrated which is similar in construction to that shown in Fig. l except that the front panel II" ofthe pen case is formed with three adjacent closed end embossed container sections |3 permitting any desired combination of pens and pencils, totaling three, to be carried,

In Figs. 8 and 9 the die 30 is illustrated for molding the front panel II" of the pen case shown in Fig. 7. This vdie is characterized by a female die section 3| and a male die section 32. The male die section 32 is provided with a resilin ently mounted center rounded projection Y33 and spaced xedly mounted rounded projections 34 on other side of the projection 33. The projec- 'tailed projections which slidably engage complementary dovetailed grooves 38 formed in the cutaway portions of the female die section 3|.

A novel means is provided for slidably supporting .the .central projection 33 of the male die section 32 causing it to enter its respective rounded groove '35 in the female die section 3| before the other projections 34 of the male die section 32. With this -construction the slidably mounted projection 33 of the male die section will form the center container section I3" on the front panel II" `before the outer embossed sections I3" are formed, preventing the outer projections 34 from gripping the leather before the `center container section I3" has been properly formed. The slidable mounting of the central projection 33 is characterized by spaced rods 40 which are attached to the top face of the top central projection 33 Aand which extends upwards and slidably engage complementary openings formed in the male die section 32. An expansion spring 4I is coaxially mounted upon each of the rods 40 `and has its top end disposed within a complementary recess 42 formed in the male die section 32. These springs -4I operate between the inner end of the openings 42 and the top face of the central projection 33 urging this projectionfinto a spaced position with relation to the male die section 32. The vtop end of an edge rod is provided with a head 43 which slidably engages a complementary opening 44 formed in the top portion of the male die section for limiting the/springs 4| from shooting the rods 40 out of their engaged position with the complementary openingsof the male die section 32. Consequently, the heads 43 act to limit downward motion of the central projection 33.

As shown in Fig. 8 the central projection 33 when the die sections 3| and .32 .are separated, has its top face spaced from the bottom face of the male die section 32 a distance equal to the thicknessof the fixed projections 34 so that this central projection "33 will enter the central groove 35 in the female die section 3| and form the central container section I3 in the piece of leather before the outer fixed projections `34 start to enter their respective grooves 35. When the outer projections 34 start entering their respective grooves 35 the 'central projection 33 'will be completely in position within its respective groove 35, and furthervdownward motion of the male die section will merely compress the springs 4I as the maledie section 32 slides kdownwards on the rods 40.

In other respects `this form ofthe invention is identical `to .the previous .form and like parts are indicated by. like 'reference numerals.

While I have illustrated and described the preferred embodiments :of my invention, it is to be understood that I do not limit myself to the wprecise constructions herein disclosed and the right is reserved to all changesand modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure `by United States Letters Patent is:

1. A die for molding leather, comprising a male die section having one or more rounded projections, a female die section having rounded grooves adapted to receive the rounded projections of the male die section, and soft metal strips removably mounted on the top corners of the roundedgrooves of said female die section.

2. A die for molding leather, comprising a male die section having one or more rounded projections, a female die section having rounded grooves adapted to receive the rounded projections of the male die section, and soft metal strips removably mounted on the top corners of the rounded grooves of said female die section, and dove-tailed projections formed on said strips and slidably engaging` complementary dovetailed grooves formed in said female die section comprising the removable mounting of said strips.

3. A die for molding leather, comprising a male die section having one or more rounded projections, a female die section having rounded grooves adapted to receive the roundedprojections of the male die section, and soft metal strips removably mounted onthe top corners of the rounded grooves of said female die section, said female die section having the top corners of its rounded grooves cut-away and said soft metal strips being shaped to replace these cutaway COIIIGI'S.

OTTO MAYER. 

